Area Code 45 – Heerlen
The phone area code for Heerlen is 45 (international format +3145). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 45
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Heerlen
Geographic Overview
The +31 45 area code is a geographic National Destination Code (NDC) within the Dutch public switched telephone network (PSTN), allocated to the southeastern part of the province of Limburg. Its primary service area is the city of Heerlen and its surrounding municipalities, including Kerkrade, Landgraaf, Brunssum, and Voerendaal. This region forms the eastern section of the Parkstad Limburg urban agglomeration, a densely populated area near the German border. The code is administered by the Authority for Consumers and Markets (ACM) and is assigned to fixed-line operators, though number portability allows subscribers to retain their 045 numbers even if they switch providers or move within the national geographic area.
Dialing Formats and Usage
Within the Netherlands, callers must dial the full national number including the trunk prefix 0, resulting in 045 followed by the seven-digit subscriber number. For example, a local call to a Heerlen business would be dialed as 045 123 4567. Internationally, callers from outside the Netherlands should drop the leading zero and dial the country code, area code, and subscriber number: +31 45 123 4567. This format is compliant with ITU-T E.164 recommendations. Since the Netherlands implemented closed dialing numbering in 1995, no local area code truncation is applied; the full national number must always be dialed even for calls within the same area code.
Geographic Coverage and Administrative Jurisdiction
The 045 area code covers the municipalities of Heerlen, Kerkrade, Landgraaf, Brunssum, and parts of Voerendaal and Simpelveld. Heerlen serves as the administrative and economic hub, with a population of approximately 87,000. The region is known for its historical coal mining heritage and is now a center for logistics, healthcare, and technology. The area code is geographically distinct from neighboring codes: to the west, 046 serves Sittard-Geleen, and to the north, 047 covers Roermond. The German border is immediately east, and calls to Germany require the international prefix 00 49.
Caller Instructions
For local callers within the Netherlands, simply dial 045 followed by the seven-digit number. For international callers, replace the leading zero with +31 (or 0031 from most European countries). When calling from a mobile phone, it is standard practice to use the international format +31 45 123 4567 to ensure proper routing. No overlay codes have been introduced in this area; therefore, the 045 code remains the sole geographic code for Heerlen and its environs.